The json has a list of passages. Each passage has [title, links, questions, text].
Overall:
[ 
  {
    title,
    links,
    questions,  (see below for structure)
    text        (Original passage for which the question was written)
  },
]

questions:
[
  {
    question,
    answer,
    question_links,  (Links labeled by question writer as relevant)
    context          (context selected by question answerer as necessary)
  }
]